Federal officials have said that at least 530 people in 38 states have now become sickened by a mysterious vaping-related lung illness.
All reported cases had a history of e-cigarette or vaping use, officials have said.
Many people have also said they used black market or illicit THC products.
Illinois’s chief medical officer, Jennifer Layden, said state officials hope to find more clues by collecting information from people who currently vape but have not gotten sick.
Officials plan to use social media to solicit responses for an anonymous survey about vaping habits to help identify what is making people sick.
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